failure of the organizing energy brings about failure "to concentrate" and the tyranny of casual associations annoys and angers. The stock complaint of the neurasthenic that everything distracts his attention is a reversion back to the unorganized conditions of childhood, with this essential difference: that the neurasthenic rebels against his difficulty in thinking, whereas the child has no rebellion against that which is his normal state. Minds differ primarily and hugely in their power of organizing experience, in so studying and recording the past that it becomes a guide for the, future. Basic in this is the power of resisting the irrelevant association, of checking those automatic mental activities that tend to be stirred up by each sound, each sight, smell, taste and touch. The man whose task has no appeal for him has to fight to keep his mind on it, and there are other people, the so-called absent-minded, who are so over- concentrated, so wedded to a goal in thought, that lesser matters are neither remembered nor noticed. In its excess overconcentration is a handicap, since it robs one of that alertness for new impressions, new sources of thought so necessary for growth. The fine mind is that which can pursue successfully a goal in thought but which picks en route to that goal, out of the irrelevant associations, something that enriches its conclusions. Not often enough is mechanical skill, hand-mindedness, considered as one of the prime phases of intelligence. Intelligence, en route to the conquest of the world, made use of that marvelous instrument, the human hand, which in its opposable thumb and little finger sharply separates man from the rest of creation. Studying causes and effects, experimenting to produce effect, the hand became the principal instrument in investigation, and the prime verifier of belief. "Seeing is believing" is not nearly so accurate as "Handling is believing," for there is in touch, and especially in touch of the hands and in the arm movements, a Reality component of the first magnitude. But not only in touching and investigating, but in pushing and pulling and striking, IN CAUSING CHANGE, does the hand become the symbol and source of power and efficiency. Undoubtedly this phase of the hands' activities remained predominant for untold centuries, during which man made but slow progress in his career toward the leadership of the world. Then came the phase of tool-making and using and with that a rush of events that built the cities, bridged the waters, opened up the Little and the Big as sources of knowledge and energy for man and gave him the power which he has used,--but poorly. It is the skill of human hands upon which the mind of man depends; though we fly through the air and speed under water, some one has made the tools that made the machine we use. Therefore, the mechanical skill of man, the capacity to shape resisting material to purpose, the power of the detailed